Initializes gruntplugin template

Adds coffeeify and browserify dependencies
Adds coffee-script dependency
Adds mixed coffee and js source files as fixtures for test
Modifies default_options to the result of running browserify -t coffeeify main.coffee > default_options in the fixtures directory
Adds failing test to ensure default_options are set correctly
Adds failing tests to ensure correct custom_options configuration
Adds command-line generated custom_options for test.